At RSI We’re looking for a part time full-stack developer to help us transition from a legacy PHP/JavaScript application to a modern React + Next.js framework. You'll collaborate with our internal team to refactor backend logic, gradually migrate features, and implement new components using modern frontend practices. You’ll work in a sandboxed environment using version control processes, with all changes reviewed and deployed internally. This role includes no direct access to production systems. What you´ll do • Refactor legacy PHP/MySQL code into modular, framework-compatible components • Build and implement new features using React + Next.js • Migrate existing frontend logic and UI to modern frontend architecture • Write clean, testable, and well-documented code using Git workflows (branches, pull requests, etc.) • Collaborate with internal developers to ensure compatibility with staging/test environments • Participate in architectural planning and framework migration strategy Required Education and Experience: • 3–5+ years of full-stack development experience • Strong experience with PHP + MySQL (legacy cleanup and refactoring) • Proven experience with React and Next.js for building modern web applications • Strong JavaScript fundamentals (async, DOM manipulation, REST APIs) • Comfortable with Git-based workflows (branching, PRs, staging) • Ability to write modular, maintainable, and well-documented code • Solid written communication skills in English (B2-C1 level)El equipo reclutador buscará estos conocimientos y habilidades en las postulaciones. Añade las que te faltan a tu perfil para atraer su atención. - Educación mínima: Universidad / Carrera técnica - 3 años de experiencia - Idiomas: Inglés